Method for first-beam-later-pier construction of pier top section of cable-stayed bridge auxiliary pier

Abstract

The invention relates to the technical field of bridge construction and specifically relates to a method for first-beam-later-pier construction of a pier top section of a cable-stayed bridge auxiliary pier. The auxiliary pier body is constructed for twice; the auxiliary pier body section is constructed at the first time; front pivot travelling basket waking space is preserved; and when a beam body on the auxiliary pier body section is poured, and the front pivot travelling basket passes the space on the auxiliary pier, the auxiliary pier top section will be constructed for the second time. The second construction of the auxiliary pier top section is characterized in that after the pier top section construction, the beam body on the pier top section will be anchored and locked on the pier top section; then, a pier top support is installed between the pier top section and the beam body; and after side-span folding, anchoring and locking of the beam body by the pier top section will be released. According to the invention, a support is installed easily with high installation efficiency; the elevation of the support can be adjusted accurately according to anchoring and locking relations, so that accuracy of support installation is increased; damage of pier body concrete is avoided; and stability of the whole bridge structure is enhanced.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a construction method for the pier top section of an auxiliary pier of a cable-stayed bridge with beam first and then pier. Background technique [0002] The span of the cable-stayed bridge is generally large, often more than 200m, and its main span generally crosses rivers and lakes and other navigable rivers with deep water depth and complicated geological conditions. If the cantilever construction method is not used, but the support construction method, push construction method or swivel construction method is adopted, it will bring greater difficulties to the construction, increase the cost of temporary construction facilities, and even affect the navigation of the river. Cantilever construction methods include cantilever assembly method and cantilever pouring method. Among them, the cantilever assembly method is mainly used for cable-stayed bridges with steel gir...

AI Technical Summary

Problems solved by technology

[0005] 1. The construction process is complicated: the front fulcrum stay cable hanging basket cannot pass through the auxiliary pier normally, and when passing the auxiliary pier top section of the main beam subsequent section, it is necessary to reinstall the front fulcrum stay cable hanging basket, and continue the cantilever construction. Segments, or use the bracket construction method for construction;

[0006] 2. Long construction time: the subsequent sections of the main girder on the top of the auxiliary pier need to re-install temporary facilities such as the front fulcrum dragline hanging basket or bracket, and the process conversion takes a long time;

[0007] 3. The construction cost is high: the utilization rate of the front fulcrum cable hanging basket is low, and additional manpower and machinery are required, which requires a large investment

However, there are still some problems in this scheme. This scheme needs to build a large number of supports for pouring the beam body and pier top structure. Brackets will undoubtedly increase the cost of beam construction and reduce construction efficiency, and for areas with special structures under the beam body, it may be impossible to build brackets, so this solution is completely unsuitable

In addition, during the process of pouring the beam body of the front fulcrum hanging basket, there is a problem of rigid collision between the support on the auxiliary pier and the poured floating beam body, which may damage the concrete structure under the support and affect the stability of the support

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